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character: Cell Membrane Structure
topic: The cell membrane is composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates which contribute to its selective permeability and fluidity.
topic: The role of the cell membrane in diffusion involves the movement of molecules across the membrane from areas of high concentration to areas of low concentration, utilizing its semi-permeable nature.
topic: The phospholipid bilayer forms the fundamental structure of the cell membrane, allowing for the passage of small, nonpolar molecules, while restricting larger or polar molecules.
topic: Transport proteins within the cell membrane assist in the facilitated diffusion of substances that cannot freely cross the lipid bilayer, ensuring the exchange of essential molecules.